I was thinking of upgrading the QutestFirst, I think you should just start a new thread to get a broader response here. Second, what specific improvements are you looking for over the Qutest?
Review on Bricasti Design M3 DAC
My review was just posted on Stereo Times website on the Bricasti Design M3 DAC. If you are searching for a DAC/streamer/analog volume control DAC, no preamp needed with the M3, in the price range of $5,000, you might want to get the details of why you might want to audition this piece. It's superlative in both build quality, innovative design, and most importantly in it's beautiful musical performance.